From b3441c109e16980bc0854f3b2cbf402a5119c7fd Mon Sep 17 00:00:00 2001
From: Dimitri Lozeve <dimitri@lozeve.com>
Date: Fri, 5 Jun 2020 16:54:20 +0200
Subject: [PATCH] Add mbedtls dependency

---
 .gitmodules         |  3 +++
 meson.build         |  6 ++++++
 src/ex07/main.c     | 47 +++++++++++++++++++++++++++++++++++++++++++++
 subprojects/mbedtls |  1 +
 4 files changed, 57 insertions(+)
 create mode 100644 src/ex07/main.c
 create mode 160000 subprojects/mbedtls

diff --git a/.gitmodules b/.gitmodules
index 9a7806c..1fbdba0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "subprojects/munit"]
 	path = subprojects/munit
 	url = https://github.com/nemequ/munit.git
+[submodule "subprojects/mbedtls"]
+	path = subprojects/mbedtls
+	url = https://github.com/ARMmbed/mbedtls.git
diff --git a/meson.build b/meson.build
index f1255f3..e1dd7c5 100644
--- a/meson.build
+++ b/meson.build
@@ -5,12 +5,18 @@ m_dep = cc.find_library('m', required : false)
 
 incdir = include_directories('src')
 
+cmake = import('cmake')
+mbedtls_proj = cmake.subproject('mbedtls')
+mbedtls_dep = mbedtls_proj.dependency('mbedtls')
+
 executable('ex01', ['src/ex01/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir)
 executable('ex02', ['src/ex02/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir)
 executable('ex03', ['src/ex03/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir)
 executable('ex04', ['src/ex04/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir)
 executable('ex05', ['src/ex05/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir)
 executable('ex06', ['src/ex06/main.c', 'src/utils.c'], dependencies: m_dep, include_directories: incdir)
+executable('ex07', ['src/ex07/main.c', 'src/utils.c'],
+	   dependencies: [m_dep, mbedtls_dep], include_directories: incdir)
 
 munit_dep = dependency('munit', fallback: ['munit', 'munit_dep'])
 
diff --git a/src/ex07/main.c b/src/ex07/main.c
new file mode 100644
index 0000000..5a2800e
--- /dev/null
+++ b/src/ex07/main.c
@@ -0,0 +1,47 @@
+#include "utils.h"
+#include <ctype.h>
+#include <math.h>
+#include <stdio.h>
+#include <string.h>
+#include "mbedtls/aes.h"
+
+#define BUF_SIZE 4096
+
+int main(int argc, char *argv[]) {
+  if (argc < 3) {
+    printf("Usage: %s <key> <filename>\n", argv[0]);
+    return EXIT_FAILURE;
+  }
+
+  const char *key = argv[1];
+  const char *filename = argv[2];
+
+  FILE *fp = fopen(filename, "r");
+  if (fp == NULL) {
+    printf("Error opening file %s\n", filename);
+    return EXIT_FAILURE;
+  }
+
+  char input[BUF_SIZE] = {'\0'};
+  size_t nread = fread(input, 1, BUF_SIZE, fp);
+  if (nread == 0) {
+    printf("Cannot read any character from file %s\n", filename);
+    return EXIT_FAILURE;
+  }
+
+  unsigned char buf[BUF_SIZE] = {0};
+  size_t len = base64_to_bytes(buf, input);
+  if (len == 0) {
+    printf("Could not decode base64\n");
+    return EXIT_FAILURE;
+  }
+
+  mbedtls_aes_context aes;
+
+  if (fclose(fp)) {
+    printf("Error closing file %s\n", filename);
+    return EXIT_FAILURE;
+  }
+
+  return EXIT_SUCCESS;
+}
diff --git a/subprojects/mbedtls b/subprojects/mbedtls
new file mode 160000
index 0000000..2a1d933
--- /dev/null
+++ b/subprojects/mbedtls
@@ -0,0 +1 @@
+Subproject commit 2a1d9332d55d1270084232e42df08fdb08129f1b